
function App() {
  const clickHand = (e) =>{
    console.log("button 被点击了" , e)
  }
  return (
    <div className="App">
      <div>
        {"this is app"}
      </div>
      <button onClick={()=> {clickHand('jack')}}>click me</button>
    </div>
  );
}

export default App;
